The vehicle in front? (3)
I believe the answer is:
van
This clue is a double definition.
'the vehicle' is the first definition.
(type of vehicle)
'in front?' is the second definition.
(I've seen this before)
(Other definitions for van that I've seen before include "Covered wagon" , "Forefront as of an army" , "Commercial vehicle or front of army" , "Pantechnicon" , "Leading part" .)